. >> as sues san mcginnis -- as susan mcginnis reports, it may not be a sweetheart deal when it comes to you and buying airline tickets. >> reporter: american airlines and u.s. airways are joining forces to form the biggest airline in the world. the combined carrier will have american airlines new look and its old name. it will rank ahead of united airlines which joined continental in 2010 and delta which absorbed northwest airlines in 2008. >> the only way to survive, at least some of the airlines believe, is to merge together, grow, and then don't overlap as much. >> reporter: with american in bankruptcy, it will be up to a federal judge to decide if the deal will be a good one for its creditors. >> american if it had not done some sort of a merger would have been interior -- inferior to its biggest competitors in terms of its network. >> reporter: federal regulators will look at whether the merger will mean less competition. >> american will have a monopoly on virtually every route that they fly. >> reporter: if the deal flies, the world's four biggest airlines would control nearly